fs/proc/interrupts.c

   1 #include <linux/fs.h>
   2 #include <linux/init.h>
   3 #include <linux/interrupt.h>
   4 #include <linux/irqnr.h>
   5 #include <linux/proc_fs.h>
   6 #include <linux/seq_file.h>
   7
   8 /*
   9  * /proc/interrupts
  10  */
  11 static void *int_seq_start(struct seq_file *f, loff_t *pos)
  12 {
  13         return (*pos <= nr_irqs) ? pos : NULL;
  14 }
  15
  16 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
  17 {
  18         (*pos)++;
  19         if (*pos > nr_irqs)
  20                 return NULL;
  21         return pos;
  22 }
  23
  24 static void int_seq_stop(struct seq_file *f, void *v)
  25 {
  26         /* Nothing to do */
  27 }
  28
  29 static const struct seq_operations int_seq_ops = {
  30         .start = int_seq_start,
  31         .next  = int_seq_next,
  32         .stop  = int_seq_stop,
  33         .show  = show_interrupts
  34 };
  35
  36 static int interrupts_open(struct inode *inode, struct file *filp)
  37 {
  38         return seq_open(filp, &int_seq_ops);
  39 }
  40
  41 static const struct file_operations proc_interrupts_operations = {
  42         .open           = interrupts_open,
  43         .read           = seq_read,
  44         .llseek         = seq_lseek,
  45         .release        = seq_release,
  46 };
  47
  48 static int __init proc_interrupts_init(void)
  49 {
  50         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
  51         return 0;
  52 }
  53 fs_initcall(proc_interrupts_init);